Dental engine



(No M9de1.)

A. P. GOULD.- DENTAL ENQ'INE.

No. 491,099. Patented Feb. 7, 1893; T

UN TED STATES PATENT OFFICE.

AARON P. GOULD, OF CANTON, OHIO.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 491,099, dated February 7, 1893.

Application filed May 31, 1892. Serial No. 435,334. (No model.)

To all whom, itmay concern: inner end of the arm E is adapted to slide in Be it known that I, AARON P. GOULD, a citithe sleeve 19 for the purpose of adjusting the zen of the United States, and a resident of pulleys on the hand piece or tool holder, and 5' Canton, county of Stark, State of Ohio, have drive wheel to the belt F. 5 invented a new and-useful Improvement in At the outer end of the arm E is provided Dental Engines, of which the following is a a swiveled elbow G, the pivot j that forms the full, clear, and exact description, reference bejoint also serves as an axle pin for the double ing had to the accompanying drawings, maksheave pulley H. 1 The inner end of the swing- 6o ing part of this specification. ing arm J is secured to the elbow G, this porto My invention relates to improvements in tion of, the arm is hollow for the purpose of dental engines, and consists in providing in a receiving the tension spring 70, and the end of single endless belt engine, means by which the the adjustable portion Z the spring 70 resting parts maybe adjusted to the belt to maintain against the end of the adjustable portion lot 65 the desired tension, to change the speed of the the arm J serves as a constant tension by forc- ,I5 tool, and to adjust the position of the horiing the pulleys on the hand piece out against zontal supporting arm. the driving belt. This movement must how- With these ends in view my invention oonever be limited to prevent too great a presssists of certain features of construction and ure on the belt and thereby cause the machine 70 combination of parts as will be hereinafter to run hard. Thereupon to adapt the parts described and pointed out in the claims. to the length of the belt, the adjustment be- Figure 1 of the accompanying drawings is tween the arm E and the support D is prov a view in perspective comprising a dental envided, the arm to slide in the sleeve bis segine illustrating my invention and a portion cured in desired adjustment by the thumb 7 5 of enlarged detail. Fig. 2 a similar view of screw m.

pulley and support for horizontal arm. Fig. At the outer end of the swinging arm J is 3 a similar view of pulley at the outer end of provided an L shaped clamp M having a cyhorizont-al arm. Fig. 4a similar view of the lindr-ical portion nand parallel arms 0 the latsame pulleyshowing the manner of putting on ter to serve as a support for the sheaves p p, 80 the belt. Fig. 5 is a similar view of the hand and q q and a pivotal connection with the piece and an enlarged section of the swingouter end portion lot the swinging arm J, the ing arm. cylindrical portion to receive the hand piece Similar letters of reference indicate corre- N, to which it is secured by the thumb piece 8. sponding parts in all of the figures of the draw- At the end of the tool holder a is provided 85 iugs. a conical pulley V having about its face two- 3 5 The base, pedal, and driving wheel are simiannular grooves forming sheaves w andw' of lar to corresponding parts in other and well different diameters as shown in Figs. 1 and 5. known machines, and will be referred to only By the use of the clamp M, either of the said as conjunctional. sheaves w or w may be held at the desired 90 A represents the vertical supporting stem, v point between the sheaves p and q, and to 40 having at its upper end a swiveled head B, to change the speed of the tool, it is only neceswhich is pivotally secured a slotted curved sary to place the large or small sheave in poarm O,and a sheave and arm support D; said sition to receive the belt F by adjusting the arm support is provided with a central socket hand piece in the clamp M. 95 a to receive the head B, in which the head is The intermediate sheave H at the joint bepivotally secured, a tubular or sleeve portion tween the arms E and J is provided with two 7 b to receive and support the arm E a projectannular grooves side by side of equal depth ing arm 0 having a threaded aperture (1 in thus forming a double sheave. In placing the which the thumb screw eis engaged. The pin belt F on the machine, the a side of the belt roe fby which the support D is secured to the is passed up from the drive wheel and over head B, serves as an axle pin for the sheave the sheaves g and a" and down and about the g, the corresponding sheave h is secured to pulley V, and up as 2' to the inside of sheave the side of the tube 1) by an axle pin '5. The 00' on wheel H, around which it is passed to the under-side and thence to and over sheave h and down the drive wheel. The belt when so placed on and about the Wheel II, will travel in the same direction about the wheel H or sheaves w and z. y

The 2 side of the belt is the pulling side which is always kept taut by the power applied to drive the tool, zv is the slack side which is turned about the sheave or groove 00 in the wheel H, by which it is held in position and the liability to fly or run off very much reduced.

Having thus fully described the nature and object of my invention, What I claim and desire to secure by Letters Patent is:

1. The combination in a dental engine of a vertical support, a head having a swiveled engagement therewith, a curved slotted arm pivoted to said head, an arm support pivoted to said head, independently of the curved slotted arm said arm support provided with an extension,and a sleeve portion, an arm inserted in said sleeve portion, means for retaining the arm in adjusted position therein, and a setscrew carried by said extension and engaged with the curved slotted arm.

2. The combination in a dental engine of the drive Wheel, vertical support, the swiveled headiand the shaft support, with two sheaves carried by the shaft support, the hand piece N pivotally secured to the arm J, clamp M adjustable thereon, sheaves p and q sheaves w w intermediate double sheave H and the belt F.

AARON P. GOULD.

Witnesses:

CHAS. R. MILLER, BENJ. G. Gown 

